Purple letters are missives generated by PurpleLetter.org to politicians, public figures and so forth, whom the writers want to impress with their message, and the color of their correspondence

You compose the letter on the site, then the site sends a letter on purple stationary in a purple-highlighted envelope, one the recipient cannot ignore.

In her most recent recent blog, Pennypacker describes the reason for the color to none other than Randy Parraz, leader of Citizens for a Better Arizona, which led the successful recall effort against ex-state Senate President Russell Pearce and is now seeking Arpaio's resignation.

"I explained that a purple letter is a way for those of us who are center right or center left to make our voices heard," she writes of her meeting with Parraz. "You know: we are not RED or BLUE, we are PURPLE.

"I asked, `Why don't we start a PurpleLetter campaign, to see if there are more people who feel that Joe Arpaio should resign?' After all this is not a RED or a BLUE issue, it's a PURPLE issue."

The idea would be to flood county Board of Supervisors Chairman Max Wilson with a tide of purple. Maybe he'd grok the message that it's not only lefties and Hispanics who are ticked off with Arpaio, but Republicans and those in the middle of the road, too.

Pennypacker writes:

"[H]ow can Republicans stand behind a man who misappropriated hundreds of millions of dollars, targets his political enemies costing taxpayers over $50 million in unnecessary lawsuits, and is under investigation by the feds for racial profiling people with brown skin?

"And what about the 400 uninvestigated cases of sex crimes against women and children that occurred under his watch?"